KR100689732B1 - Radio Resource Management Structure and Method for L2 Traffic Management - Google Patents

Abstract

The present invention relates to a wireless quality of service (QoS) resource management structure and method for traffic management in the L2 layer below the IP layer (L3) in the next generation mobile communication system. In the radio resource management structure for L2 traffic management according to the present invention, IP packets transmitted from the IP layer are classified and forwarded, and a traffic management unit for controlling traffic and controlling traffic volume according to the reallocated effective bandwidth (traffic management: TM); A traffic buffer for storing classified IP traffic identifiers and reporting measured QoS parameters indicating the status of IP packets under the control of the traffic management unit; A QoS table (QoS table) providing a target QoS parameter; And a radio resource management (RRM) for reporting measurement QoS parameters from the traffic buffer and reassigning effective bandwidth to the traffic management while taking into account the measurement QoS parameters and the target parameter. According to the present invention, since the call admission control method has correlation with resource management schemes such as effective bandwidth allocation, efficient L2 traffic management is possible in a wireless communication system, and thus high communication quality and high radio frequency for wireless packet communication can be achieved. Resource utilization can be achieved.

Radio resource management, traffic management, IP packet identifier, effective bandwidth, QoS

Description

A wireless resource management structure for managing the L2 traffic, and a method

1 is a view for explaining a quality of service (QoS) control mapping between L3 (IP layer) and L2 according to an embodiment of the present invention.

2 is a structure and an operation flowchart for wireless QoS resource management in the downlink for L2 traffic management according to an embodiment of the present invention.

3 is a structure and operation flowchart for wireless QoS resource management in the uplink for L2 traffic management according to an embodiment of the present invention.

4 is a diagram illustrating a case of using a token bucket structure as a traffic management unit according to an embodiment of the present invention.

5 is an operation flowchart illustrating a radio resource management method for L2 traffic management according to an embodiment of the present invention.

The present invention relates to a radio resource management structure and method for L2 traffic management, and more particularly, to a wireless quality of service (QoS) for traffic management in an L2 layer below the IP layer (L3) in a next generation mobile communication system. It relates to a resource management structure and method.

As a prior art, Korean Patent Application No. 2003-21359 (filed April 4, 2003) discloses an invention named "traffic monitoring method of a mobile communication system".

The prior invention relates to a traffic monitoring method of a mobile communication system network to automatically perform a periodic monitoring of the traffic state of the mobile communication system network and an alert for traffic increase.

Specifically, the traffic monitoring method in the mobile communication system according to the prior invention, a) receiving and storing traffic statistics data according to the communication of the plurality of mobile terminals from the base station controller; b) reading the traffic statistics data of the mobile communication system in a predetermined reference time unit; c) extracting traffic state determination information from the traffic statistics data; d) checking whether the extracted value falls below a predetermined reference value, which is a criterion for increasing the traffic; And e) generating a warning message by recognizing an increase in traffic when the extracted value falls below the reference value, and outputting a warning message informing of the increase in traffic, such that the system operator periodically displays the traffic statistics data. It is possible to easily grasp the traffic state of the mobile communication system network without executing the command.

By the way, the above-mentioned invention can easily grasp the traffic state of the mobile communication system network, but it cannot perform traffic management other than traffic monitoring, and also manages resources such as call admission control and effective band allocation in addition to reporting on the traffic state. There is a problem that there is no connection with.

Meanwhile, the mobile communication system includes resource allocation functions such as call admission control and traffic management functions such as traffic policing function and traffic shaping function for traffic management of IP packets in the IP layer. You need the ability to interoperate.

That is, in the next generation mobile communication system, the above-described functions are required to achieve high communication quality and high radio resource utilization for radio packet communication, but there is a problem in that the L2 layer of the conventional mobile communication system does not consider them.

An object of the present invention for solving the above problems is a radio resource for the L2 traffic management capable of efficient traffic management in the wireless communication system, and also to achieve high communication quality and high radio resource utilization for wireless packet communication. To provide a management structure and method.

As a means for achieving the above object, the radio resource management structure for L2 traffic management according to the present invention,

In the radio resource management structure for L2 traffic management in a mobile communication system supporting multi-services,

A traffic management unit (TM) for classifying and forwarding IP packets transmitted from the IP layer and controlling traffic and controlling traffic volume according to the reallocated effective bandwidth;

A traffic buffer which stores the classified IP traffic identifier and reports measured QoS parameters indicating the status of the IP packets under the control of the traffic manager;

A QoS table providing a target QoS parameter; And

Radio resource management (RRM) for reporting measurement QoS parameters from the traffic buffer and reallocating effective bandwidth to the traffic management unit (TM) while taking into account the measurement QoS parameters and target parameters.

Characterized in that it comprises a.

In addition, as another means for achieving the above object, the radio resource management method for L2 traffic management according to the present invention,

A radio resource management method for L2 traffic management in a mobile communication system supporting multi-services,

a) IP packets are classified by the IP packet identifier and stored in the traffic buffer while passing through the traffic management unit TM controlled by the radio resource management unit RRM;

b) reporting, by the traffic buffers, measurement quality of service (QoS) parameters indicating the status of the IP packet to the radio resource manager (RRM); And

c) the radio resource manager (RRM) finally assigning an effective bandwidth to the traffic manager (TM), taking into account the QoS measured from the traffic buffer and the target parameter in the QoS table;

Characterized in that it comprises a.

According to the present invention, since the call admission control method has correlation with resource management schemes such as effective bandwidth allocation, efficient L2 traffic management is possible in a wireless communication system, and thus high communication quality and high radio frequency for wireless packet communication can be achieved. Resource utilization can be achieved.

Hereinafter, a radio resource management structure and method for L2 traffic management according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The wired communication system efficiently manages signals and traffic below the IP layer by controlling traffic and controlling traffic volume by a traffic management unit interworking with an L2 radio resource management unit such as call admission control and effective band allocation.

The wireless QoS resource management structure and method for traffic management in the L2 layer according to an embodiment of the present invention applies the functions used in a wired communication system to a wireless communication system without great complexity.

FIG. 1 is a diagram for describing QoS control mapping between L3 (IP layer) and L2 according to an embodiment of the present invention, and shows a relationship between WQRM supporting QoS in L2 and QoS control mapping in L3. Giving.

Referring to FIG. 1, QoS control methods in the IP layer are mapped to a wireless QoS resource management (WQRM) method of the L2 layer. In other words, packets having the same Diffserv code point (DSCP) are mapped to other wireless QoS resource management methods corresponding to radio channel status, radio resource utilization, traffic load, and packet transmission status.

Here, differentiated services (Diffserv or DS) designate network traffic by class so as to have priority over other types of general traffic for relatively special types of traffic such that voice flow should not be interrupted. The protocol to control. In Diffserv, given a packet movement rule, a packet is applied per hop, one of 64 possible forwarding movements called per hop behaviors (PHBs), and six bits called DSCP (Diffserv code point) in the IP header. A field of length specifies the movement per hop for a given packet flow.

On the other hand, next generation mobile communication systems require more sophisticated QoS control for wireless communication than in wired communication, in order to achieve high communication quality and high radio resource utilization for wireless packet communication.

In other words, since the channel state of the next generation mobile communication system changes according to the movement and interference environment of the terminal, frequent renegotiation and adaptation generate high traffic load on the system. In particular, wireless QoS Resource Management (WQRM) has become more important than frequent renegotiation and adaptation in wired communication because it includes renegotiation and adaptation to overcome traffic and channel environment changes.

The main functions of the WQRM are divided into a call level resource management unit (CLRM) and a packet level resource management unit (PLRM).

Here, the call level resource management unit Call Admission Control (CAC) and effective bandwidth allocation (CAC) for radio resource management, IP packet classification (IP packet classification), traffic policy function for traffic management (traffic policing function) and traffic shaping function. The packet level resource manager may include a packet scheduler, a buffer manager, and a status manager.

The difference between the call level resource manager CLRM and the packet level resource manager PLRM is as follows.

The performance measurement of the call level resource management unit is a blocking probability of a new call or a handover call, and the performance measurement of the packet level resource management unit is a packet delay and a packet loss probability. However, the call level resource manager and the packet level resource manager can increase overall system performance through close interaction.

Hereinafter, a radio resource management structure and method for L2 traffic management according to an embodiment of the present invention will be described with reference to FIGS. 2 to 5.

2 is a diagram illustrating a structure and operation of a wireless QoS resource management in a downlink for L2 traffic management according to an embodiment of the present invention, and the flow of WQRM operation for the downlink is as follows.

2, in the radio resource management structure for L2 traffic management according to an embodiment of the present invention, the terminal (UE) 100 includes a WQRM (L2: 110) and an IP layer (L3: 120) protocol, The base station (BS: 200) includes protocols for WQRM (L2: 210) and IP layer (L3: 220). The WQRM 110 of the terminal 100 includes a PLRM 111, and the PLRM 111 includes a buffer manager 111-1 and a state manager (SM: 111-2).

The WQRM 210 of the base station 200 includes a PLRM 211, an RRC 212, and a CLRM 213. The PLRM 211 includes a buffer manager 211-1 and a packet scheduler 211-. 2) and state management unit (SM) 211-3. The CLRM 213 of the base station 200 includes an RRM 213-1 and a TM 213-2, wherein the RRM 213-1 includes a QoS table 213-1a and an EBA 213-. 1b) and CAC 213-1c, and the TM 213-2 includes an IP packet identifier 213-2a and a traffic policy / specification function 213-2b.

The WQRM operation for wireless QoS resource management in downlink for L2 traffic management according to an embodiment of the present invention is performed as follows:

① The L2 protocol message (eg, a new call or handover call request message) of a radio resource control (RRC) 212 of a base station (BS: 200) is a QoS table 213 of the base station 200. Mapped to a set of QoS parameters (eg, required delay value, required packet loss rate, required transmission rate, class of service, etc.) in −1a).

The effective bandwidth allocation unit (EBA) 213-1b uses the requested QoS parameters in the QoS table 213-1a and the parameters measured from the buffer management unit (BM) 211-1 to determine the effective bandwidth. Calculate

The call authentication control unit (CAC) 213-1c determines whether to accept a new call or a handover call, and predicts how much bandwidth to allocate to the accepted calls in conjunction with the EBA 213-1b. At this time, the authentication result of the CAC (213-1c) is assigned to the traffic policy / materialization function (213-2b) of the traffic management unit (TM: 213-2).

④ If the call is accepted in the call authentication controller 213-1c, the IP packets are passed to the corresponding buffer through the traffic manager 213-2.

⑤ After the packet scheduler 211-2 in the base station 200 performs scheduling on packets belonging to the accepted calls, the result of the scheduler is notified to the selected terminals UE 100.

⑥ The selected UEs (UE) 100 report an ACK / NACK message for downlink data transmitted to them to the PLRM 211 of the base station 200.

⑦ The terminal 100 reporting the acknowledgment (ACK) message transmits the transmitted downlink data to the IP layer (L3: 120), which is the upper layer of the terminal.

On the other hand, Figure 3 is a wireless QoS resource management structure and operation flow chart in the uplink for L2 traffic management according to an embodiment of the present invention, describes the WQRM operation sequence for the uplink.

Referring to FIG. 3, first, ① a L2 protocol message (eg, a new call or a handover call request message) of the RRC 112 of the terminal 100 is stored in a set of QoS tables 113-1a of the terminal. Mapped to QoS parameters (eg, required delay value, required packet loss rate, required transmission rate, service class, etc.).

② The EBA 213-1b in the base station 200 is valid by using the requested QoS parameters in the QoS table 213-1a of the base station 200 and the parameters measured from the buffer manager 211-1. Calculate your bandwidth. The CAC 213-1c also determines whether to accept the new call or the handover call and predicts how much bandwidth to allocate to the accepted calls.

③ If the call is accepted, the acceptance result of the CAC 213-1c is assigned to the traffic policy / materialization function 113-2b in the terminal 100.

④ IP packets of the accepted calls are delivered to the corresponding buffer through the traffic manager 113-2, and the terminal 100 reports the state information of its uplink buffer.

(5) After the packet scheduler 211-2 in the base station 200 performs scheduling on packets belonging to the accepted calls, the result of the scheduler informs the selected terminals 100 of the resource allocation information allocated.

⑥ The selected terminal 100 delivers uplink information to the base station 200.

⑦ The EBA 113-1b in the terminal 100 uses the requested QoS parameters in the QoS table 113-1a of the terminal and the parameters measured from the buffer management unit BM 111-1 to determine the effective bandwidth. Calculate Thereafter, the reallocated effective bandwidth is allocated to the traffic policy / specification function 113-2b) and notified to the RRM in the base station 200.

⑧ The base station 200 reports an ACK / NACK message for the transmitted uplink data to the selected terminals 100.

9. The uplink data reported to the selected terminal 100 by the ACK message is transmitted to an IP layer (L3) 220, which is an upper layer of the base station.

As a result, in the uplink of FIG. 3 as in the downlink described above in FIG. 2, in the mobile communication system supporting the multi-service, the control in the CLRM 213 in the base station 200 is satisfied in order to satisfy the required QoS of the traffic. The signal management unit (RRM) 213-1 controls traffic through the traffic management unit (TM) 213-2 and adjusts the amount of traffic, thereby efficiently managing signals and traffic below the IP layer.

Meanwhile, FIG. 4 is a diagram illustrating a case of using a token bucket structure as a traffic manager according to an embodiment of the present invention.

Referring to FIG. 4, IP packets transmitted from the IP layer are controlled by a token buffer structure 412 having a token bucket structure through an IP packet identifier 411 in the traffic management unit 410. Stored in buffer 420. Here, the traffic buffer 420 reports the necessary measurement QoS parameters to the radio resource manager (RRM) 430. Here, the token bucket generally refers to a model that defines the characteristics of traffic, and the bucket can be viewed as a counter indicating the amount of data in bytes that can be transmitted at any moment.

The effective bandwidth allocator (EBA) 431 of the radio resource management unit (RRM) 430 considers the QoS measured from the traffic buffer 420 and a target parameter in the QoS table 440, and authenticates a call. Through the interworking with the control unit (CAC) 432, the effective bandwidth is finally allocated to the buffer bucket structure 412 of the token bucket structure in the traffic management unit (TM) (410). In order to satisfy the QoS required for the traffic from the above-described series of operations, the radio resource manager 430 may control the traffic through the traffic manager TM 410 and adjust the amount of traffic.

5 is a flowchart illustrating a radio resource management method for L2 traffic management according to an embodiment of the present invention.

Referring to FIG. 5, in the radio resource management method for L2 traffic management according to an embodiment of the present invention, first, IP packets are classified by an IP packet identifier (S510), and a radio resource management unit (radio resource). It is stored in the traffic buffer while passing through a traffic management unit (TM) controlled by management (RRM) (S520).

Next, the traffic buffers report measurement quality of service (QoS) parameters indicating the status of the IP packet to the radio resource management unit (RRM) (S530).

Next, the radio resource manager RRM finally allocates the effective bandwidth to the traffic manager TM while considering the QoS measured from the traffic buffer and target parameters in the QoS table (S540). .

Next, it is checked whether a call is continued (S550) so as to use the minimum resources possible while satisfying the QoS requirements, and repeatedly performing the steps S510 to S540 while the call is continued. .

Embodiments of the present invention accommodate such functions as a traffic policing function and a traffic shaping function for efficient traffic management at the L2 layer, which is not considered in the prior art. System performance is improved through interworking with call admission control and effective bandwidth allocation. Accordingly, efficient traffic management is possible in a wireless communication system without great complexity, thereby achieving high communication quality and high radio resource utilization for wireless packet communication.

While the invention has been shown and described in connection with specific embodiments thereof, it will be appreciated that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

According to the present invention, since the call admission control method has correlation with resource management schemes such as effective bandwidth allocation, efficient L2 traffic management is possible in a wireless communication system, and thus high communication quality and high radio frequency for wireless packet communication can be achieved. Resource utilization can be achieved.

Claims (13)

In the radio resource management structure for L2 traffic management in a mobile communication system supporting multi-services, A traffic management unit (TM) for classifying and forwarding IP packets transmitted from the IP layer and controlling traffic and controlling traffic volume according to the reallocated effective bandwidth; A traffic buffer which stores the classified IP traffic identifier and reports measured QoS parameters indicating the status of the IP packets under the control of the traffic manager; A QoS table providing a target QoS parameter; And A radio resource management (RRM) for reporting measurement QoS parameters from the traffic buffer and reassigning effective bandwidth to the traffic management unit (TM), taking into account the measurement QoS parameters and target parameters; The radio resource management unit, An effective bandwidth allocator configured to calculate and reallocate an effective bandwidth using a QoS measured from the traffic buffer and a target parameter in the QoS table; And A call authentication control unit that determines whether to accept a new call or a handover call and predicts a bandwidth to be allocated to the accepted call in cooperation with the effective bandwidth allocation unit. Radio resource management structure for L2 traffic management comprising a. The method of claim 1, wherein the traffic management unit, An IP packet classification for classifying IP packets transmitted from the IP layer; And Buffer for storing the effective bandwidth allocated from the radio resource management unit Radio resource management structure for L2 traffic management comprising a. The method of claim 2, The buffer of the traffic management unit is a radio resource management structure for L2 traffic management, characterized in that the token buffer structure of the token bucket (token bucket). delete The method of claim 1, The IP packets are stored in the traffic buffer through the traffic management unit when the call is accepted by the call authentication controller, the radio resource management structure for L2 traffic management. The method of claim 1, The radio resource management unit controls the traffic management unit to satisfy the QoS required for the traffic, the traffic is controlled, according to the radio resource management structure for L2 traffic management. The method of claim 1, The target QoS parameter provided from the QoS table is selected from the group comprising a required delay value, a required packet loss rate, a required transmission rate and a class of service. A radio resource management method for L2 traffic management in a mobile communication system supporting multi-services, a) IP packets are classified by the IP packet identifier and stored in the traffic buffer while passing through the traffic management unit TM controlled by the radio resource management unit RRM; b) reporting, by the traffic buffers, measurement quality of service (QoS) parameters indicating the status of the IP packet to the radio resource management unit (RRM); And c) the radio resource manager (RRM) finally allocating an effective bandwidth to the traffic manager (TM), taking into account the QoS measured from the traffic buffer and the target parameter in the QoS table; In step c), the effective bandwidth is finally allocated through interworking with a call admission control scheme while taking into account the measured QoS and the target parameter. The method of claim 8, Performing steps a) to c) repeatedly while a call continues to satisfy the QoS requirements and to use the minimum resources possible. The method of claim 8, The traffic management unit of step a) has a traffic control function including a traffic policy function and a traffic shaping function. The method of claim 8, And wherein the target parameter is selected from the group comprising a required delay value, a required packet loss rate, a required transmission rate, and a class of service. delete The method of claim 8, And the traffic control of step a) and the paid bandwidth allocation of step c) interoperate with each other.

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